Study on Seismic Deformation and Locking State of Northern Segment of Orogenic Belt Fault Based on InSAR
The interseismic tectonic deformation field of faults in the Zagros orogenic belt was obtained based on interferometry synthetic aperture radar(InSAR)and the deformation field was decomposed by satellite spatial geometry.18 profiles were selected based on the results in order to finely reveal the spatial distribution characteristics of deformation,and deformation data was used as the constraints for the inversion of parameters of the northwest section of the Zagros respectively.Based on the screw model and dislocation model,the interseismic parameters of the northwest section of Zagros were presented.The results show that the Zagros Fault and its extensions have right-lateral slip trend,with a maximum deformation difference of 9.0～12.0 mm/a between the hangingwall and footwall,while the vertical surface deformation in the region is insignificant,with a maximum deformation of less than 2.0 mm/a.The results of the profiles show that the regional deformation has a large variation,and the block motion is active.Interseismic parameter inversion results show that the slip rate of the north and middle sections of the Zagros fault is less than 2.0 mm/a,the slip rate of the southeast section is more than 3.0 mm/a,and the slip rate of the northwest section is about 3.6 mm/a.The locking status shows that the locking coefficient of the Zagros fault is generally greater than 0.6,and there are four strong locking zones,which have a high seismic risk.
InSARZagros faultinterseismic tectonic deformation fielddeformation field decompositioninversion of interseismic parameters
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